HW5.19

 1 public class MyTriangle
 2 {
 3     public static boolean isValid(double side1, double side2, double side3)
 4     {
 5         if((side1 + side2 > side3) && (side2 + side3 > side1) && (side1 + side3 > side2))
 6             return true;
 7         else
 8             return false;
 9     }
10 
11     public static double area(double side1, double side2, double side3)
12     {
13         double s = (side1 + side2 + side3) / 2;
14         double areaSquare = s * (s - side1) * (s - side2) * (s -side3);
15         double areaSqrt = Math.sqrt(areaSquare);
16         return areaSqrt;
17     }
18 }

 1 import java.util.Scanner;
 2 
 3 public class TestMyTriangle
 4 {
 5     public static void main(String[] args)
 6     {
 7         Scanner input = new Scanner(System.in);
 8 
 9         System.out.print("Enter three sides: ");
10         double s1 = input.nextDouble();
11         double s2 = input.nextDouble();
12         double s3 = input.nextDouble();
13 
14         input.close();
15 
16         System.out.println(MyTriangle.isValid(s1, s2, s3));
17         System.out.println(MyTriangle.area(s1, s2, s3));
18     }
19 }